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aaac2cbb54
Co-authored-by: James Laskey <james.laskey@oracle.com> Co-authored-by: Sundararajan Athijegannathan <sundararajan.athijegannathan@oracle.com> Reviewed-by: alanb, mchung, psandoz, acorn, lfoltan, ctornqvi
122 lines
4.8 KiB
C++
122 lines
4.8 KiB
C++
/*
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* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "runtime/thread.inline.hpp"
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#include "precompiled.hpp"
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#include "classfile/imageDecompressor.hpp"
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#include "runtime/thread.hpp"
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#include "utilities/bytes.hpp"
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/*
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* Allocate in C Heap not in resource area, otherwise JVM crashes.
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* This array life time is the VM life time. Array is never freed and
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* is not expected to contain more than few references.
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*/
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GrowableArray<ImageDecompressor*>* ImageDecompressor::_decompressors =
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new(ResourceObj::C_HEAP, mtInternal) GrowableArray<ImageDecompressor*>(2, true);
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static Symbol* createSymbol(const char* str) {
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Thread* THREAD = Thread::current();
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Symbol* sym = SymbolTable::lookup(str, (int) strlen(str), THREAD);
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if (HAS_PENDING_EXCEPTION) {
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warning("can't create symbol\n");
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CLEAR_PENDING_EXCEPTION;
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return NULL;
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}
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return sym;
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}
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/*
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* Initialize the array of decompressors.
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*/
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bool image_decompressor_init() {
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Symbol* zipSymbol = createSymbol("zip");
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if (zipSymbol == NULL) {
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return false;
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}
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ImageDecompressor::add_decompressor(new ZipDecompressor(zipSymbol));
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return true;
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}
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/*
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* Decompression entry point. Called from ImageFileReader::get_resource.
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*/
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void ImageDecompressor::decompress_resource(u1* compressed, u1* uncompressed,
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u4 uncompressed_size, const ImageStrings* strings, bool is_C_heap) {
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bool has_header = false;
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u1* decompressed_resource = compressed;
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u1* compressed_resource = compressed;
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// Resource could have been transformed by a stack of decompressors.
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// Iterate and decompress resources until there is no more header.
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do {
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ResourceHeader _header;
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memcpy(&_header, compressed_resource, sizeof (ResourceHeader));
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has_header = _header._magic == ResourceHeader::resource_header_magic;
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if (has_header) {
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// decompressed_resource array contains the result of decompression
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// when a resource content is terminal, it means that it is an actual resource,
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// not an intermediate not fully uncompressed content. In this case
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// the resource is allocated as an mtClass, otherwise as an mtOther
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decompressed_resource = is_C_heap && _header._is_terminal ?
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NEW_C_HEAP_ARRAY(u1, _header._uncompressed_size, mtClass) :
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NEW_C_HEAP_ARRAY(u1, _header._uncompressed_size, mtOther);
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// Retrieve the decompressor name
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const char* decompressor_name = strings->get(_header._decompressor_name_offset);
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if (decompressor_name == NULL) warning("image decompressor not found\n");
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guarantee(decompressor_name, "image decompressor not found");
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// Retrieve the decompressor instance
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ImageDecompressor* decompressor = get_decompressor(decompressor_name);
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if (decompressor == NULL) {
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warning("image decompressor %s not found\n", decompressor_name);
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}
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guarantee(decompressor, "image decompressor not found");
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u1* compressed_resource_base = compressed_resource;
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compressed_resource += ResourceHeader::resource_header_length;
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// Ask the decompressor to decompress the compressed content
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decompressor->decompress_resource(compressed_resource, decompressed_resource,
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&_header, strings);
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if (compressed_resource_base != compressed) {
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FREE_C_HEAP_ARRAY(char, compressed_resource_base);
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}
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compressed_resource = decompressed_resource;
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}
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} while (has_header);
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memcpy(uncompressed, decompressed_resource, uncompressed_size);
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}
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// Zip decompressor
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void ZipDecompressor::decompress_resource(u1* data, u1* uncompressed,
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ResourceHeader* header, const ImageStrings* strings) {
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char* msg = NULL;
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jboolean res = ClassLoader::decompress(data, header->_size, uncompressed,
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header->_uncompressed_size, &msg);
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if (!res) warning("decompression failed due to %s\n", msg);
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guarantee(res, "decompression failed");
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}
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// END Zip Decompressor
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